Grinding-machine.



u. w. HIGHTDWER. GRINDING MACHINE.

ICATION FILED 050.7

151 83.299. Patented-May 16,1916.

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DANIEL W. HIGETOWER, 0F BURIiINGAME, GALIFQRNIA. 4

GRINDING-K101115312.

T 0 all who mitt may concern:

Be it known that l, llANIlEL VVIHIGH- Tmvnn, .a citizen of the United States,- residing at Burlingame, in the county of San Mateo and State of California, have invented new and useful Improvements in Grinding-lliachines, of which the following is a specification.

This invention relates to a grindingmachine.

An object of the present invention is to provide a simple, cheaply manufactured, easily operated grinding machine for grind-- ing puppet valves, and the like, such as are employed in internal combustion engines; and particularly to prov-ids a mechanism whereby an alternate oscillating and rotating movement may be transmitted to the valve or article being ground.

Further objects will he 'einafter appear.

The invention consists of the parts and the construction and combination of parts as hereinafter more fully described and claimed, having reference to the accompany ing drawings, in which- Figure l is a central vertical. section through the grinding machine. Fig. 2 is a plan view of Fig. 1 showing the cover A removed. Fig. 3 is a diagrammatic View showing the position of the cams.

Referring in detail to the drawings, A indicates a suitably shaped casing, in the lower end of which is vertically disposed and journaled a. spindle 2. Journaled in the upper end of easing A and horizontally positioned is a drive-shaft 3, upon which is secured a wheel i, on the outer face of which is formed a plurality of cams 5 of varying lengths. lnclosing the wheel 4. and forming a closure for the casing Ais a cover 6, which is provided with a handle 7. Secured on shaft 3, exteriorly of the casing, is a crank arm 8 by which rotary movement is trans mitted to shaft 3 and the wheel 4; secured thereon. a

Secured upon the upperend of spindle 2 inside of the casing is a horizontally positioned disk 9, on the upper face of which is mounted a plurality of rollers 10; there being in this instance seven in number (see Fig. 2). The rollers 10, secured upon the disk 9, are so positioned that each pin, dun ing the revolution of the disk and spindle, will come into approximate alinement with a central vertical line was drawn through Specification of Letters latent.

. Patented May 16, rate.

Application filed December 7,191.5. seriai No. cases.

the shaft They are also of-suchheight to be engaged by the cams 5 formed on wheel i and will, therefore, during the revolution of the wheel, by means of the crank arm 8, cause an oscillating movement to be transmitted to the spindle 2.

The cam members 5 are preferably of varying lengths, suchas shown in. Fig. 3, and overlapped, and each camis positioned on an angle opposite to the preceding one.

:lhi s is true of all of the cams except the two 5 indicated at 11 and 12, these being provided tor the purpose of advancing the spindle one-seventh of a revolution duringea'ch revolution of the wheel 4;. There are sevencams of varying lengths on the wheel i and seven rollers on the disk 9. The spindle will, therefore, be rotated one seventh of a revolution during one revolution of shaft 3 and will at the sam time be oscillated six times between each one-seventh of a revolution. of rotary movement.

When the machine is used for grinding puppet valves, it is only necessary to'use a tool similar to a screw-driver, or the like, such as shown at 14. The end of the spindle is socket-shaped to receive'the tool, as'shown and the set-screws 15 secure it therein. The machine is then grasped by the handle 7 and placed directly above the puppet valve in a position where the screw-driver will. register with a slot in the head of the valve; such a slot being usually provided in most forms of valves. The crank 8 isthen rotated and an oscillating movement is transmitted from the cams 5 and rollers 10 to the spindle. The valve that is being ground will swing back and forth and each cam 5 is of varying length, as shown in, Fig. 3, so that no two oscillating movements are alike.

As previously described the cams 11 and 12 being similarly positioned provide a means wherebythe spindle is rotated one seventh of a revolution during one revolution of shaft 3. The spindle is, therefore, turned oneseVent-h of a revolution, then oscillated six times, again. turned one seventh of a revolution and oscillated six times; the same cycle of operation taking place as long as the crank 8 is turned. Any pressure may be brought to bear upon the valve while it is being ground through the handle 7 without fear of cutting grooves in the valve or as the variable oscillations transmitted through the came 5, together with'the partial intermittent rotation of the spindle, produces an exact and equal grinding-of the valve surfaces.

While a plurality of cams 5 have been provided, it is obvious'that the same result maybe produced by forming a cam groove in the face of the wheel.

The machine as a whole is simple and substantial in construction and requires very 1O ments are transmitted through the crank 8 little power'for its operation as all moveand cams 5. It, furthermore, prevents inequality of grinding and, therefore; insures v a perfect finish in every, instance.

The materials and finish of the severa parts of the machine aresuch' as the experience-and judgment of the manufacturer 1 may dictate.

1. I Wish 1t understood that various changes in form, proportions and details of construction may be resorted to within the scope of the appended claims and that I do nat wish to limit myself to the specific design and construction here shown. 1 While I'have shown and described the invention in-its application to a grinding machine, the mechanical movement and principle involved is applicable to a variety or uses within the scope and purpose of the claims; and the term grinding machine as used inthe specification and claims simply indicates by Way of illustration one practical use to which the invention has'been specifically applied.

- Having thus described my invention, what thetspindle, a driving shaft journaled in the cas1ng,-a wheel havlnga succession of cam members formed thereon of varying lengths, and roller pins on the disk with which the cams are engageable.

3. In a valve grinding machine, a casing, a vertically disposed spindle journaled in the casing, a disk secured on the spindle, a plurality of upwardly extending roller pins mounted on, the disk, acam wheel journaled in the casing at right angles to the disk, a plurality of elongated cam members" formed on the wheel around its outer periphery engageable with the roller pins, said cam members being of different lengths and disposed at angles opposite to each other, and means for rotatii'ig the cam wheel.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses. I DANIEL W. HIGHIOWER.

Witnesses:

W. l'V. HEALEY, M. It EWING. 

